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Reports usages of curly braces in string templates around simple identifiers.
<p>Use the 'Remove curly braces' quick-fix to remove the redundant braces.</p>
<p><b>Examples:</b></p>
<pre><code>
  fun redundant() {
     val x = 4
     val y = "${x}" // &lt;== redundant
  }

  fun correctUsage() {
      val x = "x"
      val y = "${x.length}" // &lt;== Ok
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  fun redundant() {
     val x = 4
     val y = "$x"
  }

  fun correctUsage() {
      val x = "x" &lt;== Updated
      val y = "${x.length}"
  }
</code></pre>
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